Well, as they say, the first casualty of war is truth, but there are a number of factual events that fit the narrative of Russia under Putin being willing to flex its muscle and encourage instability in its neighbour to the west while inspiring Russians to dream of days of yore when they ruled half of Europe...

There's the numerous videos and reports from organisations like Amnesty International, accusing Russia of basically doing the Assad thing of bombing the shit out of civilian populations in Syria (which is bound to cause more refugees to flee). And then the whole Turkey airspace thing. And then reports of Russian troops conducting large "training exercises" in the exact region they'd need to be to start a war with Turkey... There's the Crimea/Ukraine thing, which fit into that pattern as well.

Overall, no matter which source you read, Russia is currently spelling trouble. I was worried about Trump being elected and starting World War 3 - I'm now worried that even without Trump we might get there thanks to Putin.